How to integrate my User to Spring Security xml

I'm starting to learn Spring Security and I'm having some doubts. I used to authenticate users using phaseListener . I have the User MB where its scope is @SessionScoped . How can I pass this user and configure it in this xml:

<beans:beans xmlns="http://www.springframework.org/schema/security"
  xmlns:beans="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/security
           http://www.springframework.org/schema/security/spring-security-3.1.xsd">

    <http pattern="/javax.faces.resource/**" security="none" />

    <http auto-config="true" use-expressions="true">
        <intercept-url pattern="/Home.xhtml" access="isAuthenticated()" />
        <intercept-url pattern="/suspensao/SuspensaoBegin.xhtml*" access="hasAnyRole('INICIO', 'ADMINISTRADORES')" />
        <intercept-url pattern="/suspensao/SuspensaoMiddle.xhtml" access="hasAnyRole('MEIO', 'ADMINISTRADORES')" />
        <intercept-url pattern="/suspensao/SuspensaoEnd.xhtml" access="hasAnyRole('FIM', 'ADMINISTRADORES')" />
        <intercept-url pattern="/**" access="denyAll" />
    </http>

    <authentication-manager>
        <authentication-provider>
            <user-service>
                <user name="Diego" password="123" authorities="INICIO" />
                <user name="Joaquim" password="321" authorities="ADMINISTRADORES" />
            </user-service>
        </authentication-provider>
    </authentication-manager>

</beans:beans>

In short, I would like to move users dynamically so that I can login and authenticate.